Chuck.



J. SHARP.

CHUCK.

APPLICATION FILED MAR. 21. m1.

' 1,273,546. Patented July 23,1918.

FIG 1 FIG. 2

e 4i 6 Hl \HH \Hl \H /3 6- /3 J /2 g/ I 3 47 JOHN SHARP, 0F QAKMON'I, PENNSYIJVAIBHA- CHUCK.

Specification of Letters Patent.

Patented July 23,1918.

Application filed March 21, 1917. Serial No. 156,346.

To all whom it may concern:

Be it known that I, Jonu SHARP, a citizen of the United States, and resident of Oakmont, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Chucks; and I do hereby declare the following, to be a full, clear, and exact description thereof.

My invention relates to chucks, more particularly to that type of chuck known as friction chucks, that is, a chuck which holds and drives the work solely through frictional engagement with the work.

The invention is devised primarily to provide chucking mechanism for engaging and rotating tubes, caps and the like of smooth exterior, and has special advantages when, by reason of the nature of the work to be done, or of the shape of the work to be held, ordinary collets or chucks cannot be employed.

The invention is directed particularly, though not exclusively to a chuck for bottle capping machines for rotating threaded bottle caps, to screw-seat the caps on the bottles.

The invention consists in the novel structural features and combination and arrangement of parts hereinafter fully described and claimed; and illustrated in the accompanying drawings, in which Figure 1 is a vertical sectional view of a chuck made in accordance with my invention; Fig. 2 is an elevation, part in vertical section of the chuck in operative driving engagement with the work; and Fig. 3 is a bottom plan view of the chuck. The numeral 2 indicates the body or barrel of the chuck, which is screw-threaded for attachment to the head 3 of the chuck-spindle 4:. A cap-piece 5 surrounds the spindle and is screw-threadedly connected to the body. Set-screws 6 secure the cap to the spindle and prevent rotation 0r unscrewing of the cap.

By this arrangement it will be seen'positive locking means is provided which pre vent unscrewing of the thread connected parts and the arrangement permits of ready detachment of parts for repairs and for adjustment as hereinafter described.

The lower end of the chuck body has the work-centering and receiving opening 7; and the body has a shoulder 8 formed therein adjacent the opening adapted as a seat for supporting a friction workengaging collet or ring-jaw 9. This ring-jaw preferably has its bore slightly tapered so as to provide wedging frictional engagement with the work. A follower ring 10 rests upon the collet and forms a seat for a compression spring 11. Spring 11 is inter posed between the follower and an abutment of the spindle head, and when compressed and under tension by engagement of the collet with the work produces friction between the follower and the collet for driving the collet. The collet in this instance is free on its seat, and is connected to the chuck in driving only through friction engagement when the spring 11 is under tension. This is a preferable arrangement, as means is thus provided which permit slipping between collet and follower when overloading occurs, and which prevents excessive wedging of work in the collet. Positive driving of the collet or ring may be had by providing flat faces to the collet and corresponding flat faces to the barrel, or by key, connection.

The fixed abutment for spring 11 is so constructed as to provide means for varying the tension of the spring. This is accomplished in the following manner: A floating ring 12 is provided against which the spring bears. This ring seats upwardly against the ends of pins 13 loosely journaled in the spindle head. The heads of the pins engage the inner face of the cap-piece, and are held against upward movement. It will be seen that by adjusting the cap-piece on the barrel, these pins will be permitted to move up or down according to the direction in which the cap is screwed, and in this manner the springs tension may be regulated. Also the pins may be removed, and longer pins or shorter pins substituted, to increase or decrease the spring-tension for different kinds of work.

The chuck is provided with ejecting means for freeing the work from the wedge collet, said means comprising a plunger 15, which has a flange 16 for seating on the collet 9. A spring 17 is interposed between the upper face of the plunger and a seat in the spindle head. The spring acts normally to seat the plunger on the collet, and the plunger projects into the bore of the collet or ring far enough so as to be engaged by the work before the work engages the frictiondrive collet. In this manner, it will be seen 110 that the spring 17 will be put under tension, and will act to eject the work from the ring When the chuck is moved to free thewvork. Provision for varying the tensionof the,

vention as particularly adapted ifor chuck- 5 ing caps, and the like, there is presented a structi'ireadapted' for holding and driving by? edge engagement other articles, such thin" tubes :and the like inother arts, suchas in lathe Work, and such thin material may be chucked-With less liability to damage.

than-Would be=the caseif the'usua'l compression and-eXpandingjaW type of chuckwere employed It'- vvill be apparent that the chuckmay be varied-inmany particulars and' structural 7 details Without departing from the spirit 0]? the invent-ion.

What I claim is j 1. A chuck-comprisingthe combination of a chuckj-body having arcy-li'ndrical here, said chuck adapted to receive the'WOIk endWise j v g chuck adapted to receive the Work endvvise of the bore, a floating'jaw' disposed Within the bore ofthe body forfri'ctionally holdin g l the-W0rk;'and flexible means in the bore lon gitudinally-yieldable therein for effecting yield'ablerotary', driving connection of the v law to the bodyf driving thework' 2. A chuck comprising the combination-of a chuc k ibody having a cylindrical bore, said chuck-adapted to "receive the Work endvvise off'the bore, a floating jaW disposed Within the bore of the body for frictionally holding i thewvork, and flexible friction means disposedwithln the bore adapted for abutting engagement 'With the jaw for driving the- Work.

3111i a chuck the combination of a-chuck-,

body having acylindrical bore, and an ejecti borei a I 4t. A chuck comprising the combination of.

tudiiial androtanymovement therein, and i means-operative by vthe holder for effecting ingyvork-holde'r comprising airin -like member rotatably fitting the bore of the body and havinga bore for the reception of the work, and havingan ejecting plunger Within the a chuckwbodyj having a cylindrical bore, said chuck adapted to receive the Work endWise of the .bore za holder forthe Workdisposed Copies of this: patent maybe obtained. for

yieldable abutting connection betyveen the body and the holder for driving the Work.

5. Achuck comprising the combination of Within the bore and adapted to have long} and the' holder for drivingtheWork, and

means *for changing the degreecf yield ability of said connection.

a chuck-body having'a cylindrical bore, said chuck adapted to receive the"Workcnchviseot the bore, aholder forthe Work disposed a chuck-body having a cylindrical bore, said chuck adapted to receive the Work endwise of -tl16-bOl'6,-2t holder for the Work disposed 6.' A chuck comprising the combination 0r ii Willllill'llllB bore and adapted to have longi-j tudinal and rotary movement therein eject ing mechanism, and means operativeby 'th e holder for effecting *yieldable abutting cona nection. between the body and the holder for driving the Work.

7. A chuckcomprisingthe combination of a chuck-body having a cylindrical bore,isaid of the bore, a holder for the'vvork'disposedi Within the bore and-adapted "tohave 'lon'gi tudinal and rotary movement therein, ejecting mechanism carried by the holder for ejecting the WOI'k from the holder; and means and the holder lor driving the WOI'lL 8. In a chuck,thercombination of a chuck;

body having a cylindrical bore, a Work-5 holder comprising a ring-like member rotatably fitting the bore ofthe bodyandhav ing a bore for centering and for holding the by the vvork holder and having a'plunger member for actuating said member;v

Work, an ejector member normally carried .projecting into the bore of 'the holder, a 1

spring interposed between the holderand}v j j the end Wallof'the body for frictionallyconj neetin-g said holder tothe body an'd a spring,

interposed betweensaid Wall andthe ejector In testimony whereof, I, the said on SHARP, have hereunto set myhand.

Witnesses: H V r V RoB'r. D'JTOTTEN 7 JOHN F VVL LLL.

five cents each, byad dr'essing the Commissioner 'o f'IPatents, Washington, DIE."

j Jonnsi-iAnn 

